Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Jigs and
Fixtures
By S K
Introduction
Jigs and fixtures are devices that are used for
production of repeated parts essentially for
mass production.
Functionality of Jigs or fixtures:
Locating
Clamping
Supporting
Resistance to cutting forces
Safety
Jig
Bot

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Shaper, Planner,
Slotter
By S K
Mondal
Shaper
Shaper
The
relative motions between the tool and the
workpiece, shaping and planing use a straight-line
cutting motion with a single-point cutting tool to
generate a flat surface.
In shaping, the workpiece is

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Elastomer
Elastomers
Elastomers are a special class, of linear polymers
that display an exceptionally large amount of
elastic deformation when a force is applied.
Many can be stretched to several times their
original length. Upon release of the force, the

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Crystalline Materials
Crystalline material and Crystal
Structures
Stable crystal structure satisfies
The crystals are electrically neutral.
The ion-ion repulsion is minimized.
The ions or atoms in crystals are packed as
closely as possible under the co

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Plastics
Plastics or polymer
Definition: A group of engineered materials
characterized by large molecules that are built
up by the joining of smaller molecules.
They are natural or synthetics resins.
Properties of plastics
Light weight
Good resistance to

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Plain Carbon Steel
Plain-Carbon steel
Due to lack of tensile strength and hardness
pure iron is not used.
Most important alloys element is carbon.
Maximum amount of carbon that can be
alloyed with iron is 6.67%.
Alloy containing upto 2% carbon is steel an

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Heat Treatment of
Metals
Heat Treatment
Heating a metal or alloy to various definite
temperatures, holding these for various time
durations and cooling at various rates.
Combination of controlled heating and cooling
determine not only the nature and distr

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Metal
Casting
By S K
Sand casting
Sand casting uses ordinary sand as the
primary mould material.
The sand grains are mixed with small
amounts of other materials, such as clay and
water, to improve mouldability and cohesive
strength, and are then packed

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

1. If thermal conductivity of a material of wall varies as ko(1 - a ~ )the
, temperature at the center of
the wall will be ( a is +ve)
(a) Depends on other factors
(b) More than that in case of constant thermal
(c) Less than that in case of constant therm

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Page:
INDIAN
SPACERESEARCH
ORGANISATION
MECHANICAL ENGINEERING
-
1.
I OON
b) IOOON
c) IOOOON
ti) ION
If the stream function is given by Y= 3xy, then the velocity a t a point (2,3) will be
a) 7.3 1 unit
3.
-I
A hytlraulic press has a ram of 15 crn diameter

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

The ultimate tensile strength and yield strength of most of the metals, when temperature falls
~
from 0 to - 1 5 0 will
1
(a) Increase
2.
(b) Decrease
(c) Remain same
(d) First increase and then decrease
"Troosite" is obtained when
(a) Quenching steel dur

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
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Fall 2015

Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by CamScanner
Scanned by Ca

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
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Fall 2015

l
l
l
l
l
l
l
Mechanical paper 2013 Set A
A concentrated load P is applied at the end of a cantilever as shown in Fig. The cross section of
the beam is a square of side ’a’ with a hole of dia 'a/Z’. The deflection at the tip of the
cantilever is giv

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

Resistance
Welding
By S K
Resistance Welding
Principle
Both heat and pressure are used.
Heat is generated by the electrical resistance
of the work pieces and the interface between
them.
Pressure is supplied externally and is varied
throughout the weld cyc

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
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Fall 2015

www.TheMech.in
CHAPTER 9
REFRIGERATION & AIR-CONDITIONING
YEAR 2012
ONE MARK
Common Data For Q.1 and Q.2
A refrigerator operates between 120 kPa and 800 kPa in an ideal vapour
compression cycle with R-134a as the refrigerant. The refrigerant enters
the c

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

www.TheMech.in
CHAPTER 8
THERMODYNAMICS
YEAR 2012
MCQ 8.1
Steam enters an adiabatic turbine operating at steady state with an enthalpy
of 3251.0 kJ/kg and leaves as a saturated mixture at 15 kPa with quality
(dryness fraction) 0.9. The enthalpies of the s

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

www.TheMech.in
CHAPTER 4
THEORY OF MACHINES
YEAR 2012
MCQ 4.1
ONE MARK
The following are the data for two crossed helical gears used for speed
reduction :
Gear I : Pitch circle diameter in the plane of rotation 80 mm and helix angle
30c.
Gear II : Pitch c

Maulana Azad National Institute of Technology or National Institute of Technology, Bhopal

production

MECHANICAL 1000
-
Fall 2015

www.TheMech.in
CHAPTER 11
INDUSTRIAL ENGINEERING
YEAR 2012
MCQ 11.1
ONE MARK
Which one of the following is NOT a decision taken during the aggregate
production planning stage ?
(A) Scheduling of machines
(B) Amount of labour to be committed
(C) Rate at wh